v3.26.1
Debt and Credit Facilities - Changes in Long-Term Debt - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Debt Instrument [Line Items]    
Issuance of Long-Term Debt $ 1,000 $ 1,900
Repayments of Long-term Debt 450 0
Public Service Electric and Gas Company [Member]    
Debt Instrument [Line Items]    
Issuance of Long-Term Debt 1,000 900
Repayments of Long-term Debt 450 $ 0
Medium Term Notes Four Point Twenty Due Two Thousand Thirty One [Member] | Public Service Electric and Gas Company [Member]    
Debt Instrument [Line Items]    
Issuance of Long-Term Debt $ 500  
Debt Instrument, Interest Rate, Stated Percentage 4.20%  
Medium Term Notes Five Point Sixty Three Due Two Thousand Fifty Six [Member] | Public Service Electric and Gas Company [Member]    
Debt Instrument [Line Items]    
Issuance of Long-Term Debt $ 500  
Debt Instrument, Interest Rate, Stated Percentage 5.63%  
Medium Term Notes Zero Point Ninety Five Percent Due Two Thousand Twenty Six [Member] | Public Service Electric and Gas Company [Member]    
Debt Instrument [Line Items]    
Repayments of Long-term Debt $ 450  
Debt Instrument, Interest Rate, Stated Percentage 0.95%